开发时使用日志框架，配置不好的话则产生一大堆日志问题，特别没有配置自动删除。

学习python时正好找找，东拼西凑的写了个脚本。

我这里日志配置的每天自动切分日志，形成1天1个日志文件夹（文件夹格式：YYYY-MM-DD），里面包含info,error日志。结构如下：

[sky@iZt4nip56cf5a8v01ya8z7Z testProj]$ ll
total 11616
drwxr-xr-x 3 root     root    4096 Oct  9 00:05 2021-10-03
drwxr-xr-x 3 root     root    4096 Oct 10 00:22 2021-10-04
drwxr-xr-x 3 root     root    4096 Oct 11 00:04 2021-10-05
drwxr-xr-x 5 root     root    4096 Oct  6 06:08 2021-10-06
drwxr-xr-x 4 root     root    4096 Oct  7 04:05 2021-10-07
drwxr-xr-x 5 root     root    4096 Oct  8 04:22 2021-10-08
drwxr-xr-x 5 root     root    4096 Oct  9 06:27 2021-10-09
drwxr-xr-x 5 root     root    4096 Oct 10 07:03 2021-10-10
drwxr-xr-x 5 root     root    4096 Oct 11 06:38 2021-10-11
-rw-r--r-- 1 root     root 2424510 Oct 11 15:23 error_log.log
-rw-r--r-- 1 root     root 4540277 Oct 11 15:30 run_log.log
-rw-r--r-- 1 root     root 4876445 Oct 11 15:17 warn_log.log

可以看到 testProj 下有很多日期命名的文件夹，

自动删除逻辑：例如自动删除7天以前的日志。

1. 获取当前日期，并计算出前7天日期

now = datetime.datetime.now()
last7d = now - datetime.timedelta(days=days)

2. 获取项目日志文件夹下文件列表

listdir = os.listdir(logDir)

3. 遍历文件列表，获取文件名跟前7天日期比较。小于则删除

       for d in listdir:
           if d == 'run_log.log' or 'error_log.log' == d or 'warn_log.log' == d:
               continue
           try:
               t = datetime.datetime.strptime(d, '%Y-%m-%d')
               tdd = datetime.date(t.year, t.month, t.day)
               if tdd < last7dd:
                   # 小于前7天日期，则删除。利用shutil.rmtree，迭代删除
                   logger.info('deleting {}'.format(logDir + '/' + d))
                   shutil.rmtree(logDir + '/' + d)
           except BaseException as e:
               # 防止存在其他文件导致文件名转日期报错
               logger.exception(e)

这里用了第三方的日期框架loguru 使用时需要先安装
pip install loguru
可能会提示pip需要更新，根据提示先更新pip，再安装即可

完整代码：

import datetime
import os
import shutil
import sys, getopt
from loguru import logger

# definde logs base dir.
log_base_dir = 'logs/delete_old_log'
logger.add(log_base_dir + "/run_log.log", rotation='10MB', enqueue=True, encoding='utf-8', level='INFO', backtrace=True, diagnose=True)
logger.add(log_base_dir + "/error_log.log", rotation='10MB', enqueue=True, encoding='utf-8', level='ERROR', backtrace=True, diagnose=True)

def delete_dir(logDir, days):
    """
    delete method.
    ------
    Parameters
    ------------
    logDir : str
        log der
    days: int
        delete before days
    """
    now = datetime.datetime.now()
    last7d = now - datetime.timedelta(days=days)
    last7dd = datetime.date(last7d.year, last7d.month, last7d.day)
    logger.info('will delete {} dir'.format(last7dd))

    listdir = os.listdir(logDir)
    # logger.info(listdir)
    for d in listdir:
        if d == 'run_log.log' or 'error_log.log' == d or 'warn_log.log' == d:
            continue
        try:
            t = datetime.datetime.strptime(d, '%Y-%m-%d')
            tdd = datetime.date(t.year, t.month, t.day)
            if tdd < last7dd:
                logger.info('deleting {}'.format(logDir + '/' + d))
                shutil.rmtree(logDir + '/' + d)
        except BaseException as e:
            logger.exception(e)
            # logger.exception('process error, dir[{}], error info:{}'.format(d, e), e)

if __name__ == "__main__":
    try:
        opts, args = getopt.getopt(sys.argv[1:], 'd:f:', ['days=', 'folder='])
        logDir = '/home/skyjilygao/logs/testPorj'
        days = 7
        for opt_name, opt_value in opts:
            if opt_name in ('-d', '--days'):
                days = opt_value
                continue
            if opt_name in ('-f', '--folder'):
                logDir = opt_value
                continue

        logger.info('config info. [folder={}, days={}]'.format(logDir, days))
        logger.info('delete start...')
        delete_dir(logDir, int(days))
    except BaseException as e:
        logger.exception('unknow error',e)
    finally:
        logger.info('delete end...')

相关源码见Github : delete_old_log_file